31323917 has 2 divisors, whose sum is σ = 31323918. Its totient is φ = 31323916.

The previous prime is 31323889. The next prime is 31323923. The reversal of 31323917 is 71932313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22762441 + 8561476 = 4771^2 + 2926^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323917 - 2¹⁴ = 31307533 is a prime.

It is a super-3 number, since 3×31323917³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31323917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31326917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661958 + 15661959.

It is an arithmetic number, because the mean of its divisors is an integer number (15661959).

Almost surely, 2^31323917 is an apocalyptic number.

It is an amenable number.

31323917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323917 is an equidigital number, since it uses as much as digits as its factorization.

31323917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 29.

The square root of 31323917 is about 5596.7773763122. Note that the first 3 decimals coincide. The cubic root of 31323917 is about 315.2284124810.

The spelling of 31323917 in words is "thirty-one million, three hundred twenty-three thousand, nine hundred seventeen".